Exporting problems in Premiere Pro CC

Hi.
The past few projects I have worked on with Premier have been causing some major and mysterious problems when it comes to both the rendering and export stage of the workflow.
Each time I export the project I receive a warning with very little detail that is closing down the whole program.
All the files used are saved natively to my mac, and the export is also being saved natively.
My machine details are as follows:
Model Name: iMac
Processor Name: Intel Core i7
Processor Speed: 3.5 GHz
Number of Processors: 1
Total Number of Cores: 4
L2 Cache (per Core): 256 KB
L3 Cache: 8 MB
Memory: 16 GB

I have been sure to update my Premiere Pro application from CC, and recently uninstalled and reinstalled the App.
I'm not quite sure what's going wrong or how to trouble shoot the project.

I've included screen shots of my export settings - which are fairly standard so far as I know.

Hi Jon.
Sorry the screen shots didn't make it to the post.
None of the media I'm using is on a different drive. Everything is saved natively to the machine, sitting in a neat set of files on the OSX Desctop.
The machine itself runs pretty well -
Processing: 3.5 GHz Intel Core i7
Memory: 16 GB 1600 MHz DDR3
Graphics: NVIDIA GeForce GTX 780M 4096 MB

Do you have Adobe Media Encoder installed? Try Queuing the video out to media encoder. Also, you might start a clean project, import your old project into it, save it new, clear the cache, save again, close, open again and then export the sequences. Sometimes the cache files get too big or too heavy for it to process correctly, and in trying to call up more room or more memory start points, it fails. Check how much ram you allocated to the program in your preferences.
Also, without adobe media encoder, some video formats will look okay in projects, but never render out.